A. C. Graham's Later Mohist Logic, Ethics, and Sciences is the only Western-language translation of the obscure and textually corrupt chapters of the Mozi that purportedly constitute the foundations of ancient Chinese logic. Graham's presentation and interpretation of this difficult material has been largely accepted by scholars. This article questions the soundness of Graham's reconstruction of these chapters . Upon close examination, problems are revealed in both the structure and the content of the framework Graham uses to interpret the Canons. Without a more reliable framework for interpreting the text, it seems best to remain skeptical about claims that the Canons represent evidence for the study of logic in early China